The 21-year old USA international, one of three MLS Most Valuable Player nominations, will spend most of the North American off-season in North London and Gunners boss Arsene Wenger is looking forward to seeing him at close quarters.
"It's a training period for him to see what his top level is like," Wenger told Arsenal Player.
"The MLS encourage their players to go out to Europe during their off-season for improvement, practice and to have contact with top-level football.
"That's why Brek Shea is coming here. It is a learning experience for him.
"Brek will train with the first-team when it is possible and practice with the best prospects of the club as well outside of the normal sessions.
"There is not a better place than the Premier League to do that."